How to not return a regex match if a user agent string contains Chrome?

Question

I have want to create a regex pattern that will provide a match for a safari user agent string. The problem is that Chrome also seems to match:

Safari Regex:

(?!Chrome).*Safari

This still matches against a Chrome user agent string, but I thought that the negative look ahead would resolve this issue?

Chrome user agent:

Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.73 Safari/537.36

Safari user agent:

Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.20.25 (KHTML, like Gecko) Version/5.0.4 Safari/533.20.27

Can anyone provide me with a regex solution for this?

Update:

The answer I was directed to at Efficient User-Agent Regex to find Safari in Python does not provide a regex solution for this problem. In fact, it doesn't address the issue at all, so I am suprised it was accepted as an answer

Thanks

Possible duplicate of Efficient User-Agent Regex to find Safari in Python — bfontaine
– bfontaine, Commented Sep 28, 2017 at 14:13
Use ^(?!.*Chrome).*Safari or, to ensure whole words are checked for, ^(?!.*\bChrome\b).*\bSafari\b — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Sep 28, 2017 at 14:21

Wiktor Stribiżew · Accepted Answer · 2017-09-28 17:52:14Z

2

You may use

^(?!.*Chrome).*Safari

See the regex demo.

Details

^ - start of a string
(?!.*Chrome) - fails the match if there is Chrome substring after 0+ chars other than line break chars
.* - any 0+ chars other than line break chars
Safari - Safari substring.

Update (fixing issues in your answer)

Regex for Safari:

^(?!.*(?:Chrome|Edge)).*Safari

Regex for Chrome:

^(?!.*Edge).*Chrome

Regex for Edge:

/Edge/

edited Sep 28, 2017 at 17:52

answered Sep 28, 2017 at 14:36

Wiktor Stribiżew

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3 Comments

Charles Robertson Over a year ago

Excellent. And thank you for the explanation. Much appreciated. I will accept this as the answer...

Wiktor Stribiżew Over a year ago

@CharlesRobertson Great, please do.

Machado Over a year ago

Others answers are great, but this is the right one for the question.

dawg · Accepted Answer · 2017-09-28 17:08:48Z

1

This works:

^(?!.*\bChrome).*$

Demo

Or,

 ^(?!.*\bChrome).*\bSafari

If you are looking for the Safari match without Chrome specifically

The issue with your regex (?!Chrome).*Safari is you need the .* to match what is in front of the Chrome in the negative look assertion at the start of the string.

edited Sep 28, 2017 at 17:08

answered Sep 28, 2017 at 14:23

dawg

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1 Comment

Charles Robertson Over a year ago

Brilliant. Thanks for this, and to think the moderator was pointing me to a previous post with an accepted answer that was completely off topic. I knew there was a regex solution, out there...

Charles Robertson · Accepted Answer · 2017-09-28 17:16:11Z

1

Building on @Wiktor Stribiżew & @dawg excellent answers, I felt it might be useful for anyone looking for a complete solution to the 3 browsers that contain 'safari' in their user agent string:

Regex for Safari:

^(?!.*Chrome|Edge).*Safari

Regex for Chrome:

^.*Chrome(?!.*Edge)

Regex for Edge:

Edge

answered Sep 28, 2017 at 17:16

Charles Robertson

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1 Comment

Wiktor Stribiżew Over a year ago

I added fixes for the issues in this answer to my answer.

Eselfar · Accepted Answer · 2017-09-28 17:32:24Z

0

Have you tried this basic one? It matches Safari only.

.*(Safari).*

See test on regex101.

answered Sep 28, 2017 at 17:32

Eselfar

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Comments

Rani · Accepted Answer · 2018-01-03 06:26:13Z

0

The answers above are correct for desktop and maybe Android. For iOS:

^(?!.*CriOS).*Safari

answered Jan 3, 2018 at 6:26

Rani

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